screw compressor - Rev B

A screw compressor i made to see if something like this could work. I designed it when Covid started and there was a shortage of ventilators. So it was an attempt to maybe help in some way.

The gaps between the layers prevented a decent compression. So with my printer it did not really work.

But at least it looks cool! 

Here is a video of the compressor design:
 

And here is a video of me testing my design:
 

Here are the Fusion 360 files:
https://a360.co/3b4nH3q

Here are the codes for the arduino:
https://github.com/MlePh/3D-printed-screw-compressor

Print instructions

With exeption of the gears, all parts can be printed with standard settings. Gears with 100% infill. No support needed at any part.

I used PETG. But PLA could also work.

Parts needed for the compressor:

• 5 pcs 608Z ball bearing (used for inlineskates - very common size)
• 2 pcs 8mm rods (steel, aluminium, cfk,...) -> cut to 130mm length
• 7 pcs M3x30 screws
• 10 pcs M3x10 screws
• 2 pcs potentiometers
• brushless DC motor (i used a MultiStar 2216-800kV motor)
• ESC for the DC motor
• arduino nano
• 5V BEC (if the ESC doesn't provide 5V power)
• DC power source with more then 12V (i used a 4S lipo battery)

If the screws have to much friction inside the cylinder, you may have to sand it. To do that, i designed a grinding tool, that fits the inner diameter of the two cylinders.

Parts needed for the grinding tool

• sand paper (400), cut to 20mm stripes
• M10 threaded rod with two screw nuts
• 4 pcs M3x10 screws